Device for balancing bodies capable of alpha rising and falling movement



1931- H. R.. WEBB ET AL ,661

DEVICE FOR BALANCING BODIES CAPABLE OF- A RISING AND FALLING MOVEMENT Original Filed June 8, 1929 specification in connection with the attached Patented Dec. 1, 1931 iJNrrED STATES.

PATENT OFFICE HARRY RILEY WEBB AND HARRY NEWTON WEBB, or GRANTHAM, ENGLAND DEVICE'FOB BALANCING BODIES CAPABLE OF A RISING FALLING MOVEMENT Original application filed June 8, 1929,-Seria1 No. 369,477, and in Great Britain February 5, 1929. Divided and this application filed June 14, 1930. Serial No. 461,244.

This invention comprises an improved device for balancing bodies capable of a r sing and falling movement. In the specification of our co-pending application for patent, Serial No. 369,477, filed June 8, 1929, of which the application of this case is a division means have been described whereby a body may be balanced at successive positions throughout the range, of its movement, said means comprising,in one instance, acham adapted to be wound onto or from a rotatable springinfluenced drum, the positions taken up by the chain links on passing onto or from said drum causing a cyclic variation in the moments of the forces applied to the drum by the weight of the body to be balanced. I i

The principal object of the present invention is to provide means whereby a compensating effect may be obtained in respect of t the forces exerted by the balancing means at different positions in the movement of the body, in addition to .the above referred to periodic or cyclic variations in the moments of the force applied to the balancing means 1 by the weight of the body. U i

A further object is to do away with the necessity of independent locking mechanism in connection with displaceable bodies and to provide means whereby the body to be balanced may be moved to the desired position whereupon, if necessary, an automatic movement takes placeto such position that equilibrium between the opposing forces is attained.

A still further object of the present invention is to provide means of a simple and cheaply constructed nature functioning to maintain an effective balance at successive and separated positions throughout the range of movement of the body.

Further objects are attained by the novel construction and arrangement of'the parts forming the subject of the present invention, whichobjects will be more fully apparent after consideration of the accompanying drawings wherein Fig. 1 represents a diagrammatic elevation of a traversable window incorporating bal f ancing mechanism in accordance with the present invention and, I

Fig. 2 is an end view of Fig. 1.

The attached drawings represent by way of example the application of a balancing device to a movable window such for example as those employed in automobiles although the invention is not tobe regarded as limited to this purpose.

Below the window 1 is provided a rotatable drum or roller 2 actuated in one direction by meansof an internalspring 5 connected therewith at one end, said spring being mounted on, and attached at the other end to a central stationary spindle 6 mounted in bearing brackets g'carried on a channel member 4 associated with the lower edge of the window. The spring influenced drum 2 is, in this manner made displaceable with the window 1 to be balanced.

A chain or the-like 7 is securedto the outer face of the drum in any suitable manner and is adapted to be wound on to or from said drum on displacement of the window; the opposite end of such chain being connected to, a pin or the like on a stationary cross-bar or a member 8 disposed above the drum 2, the arthe opposite ends of the chain 7 and by virtue of the chain being connected with a stationary part 8 the lifting or balancing force is applied to the body 1. As the successive chain links pass onto or from the drum 2 such links take up various, angular dispositions thereon the effect of which is to cause a cyclic variation-in the moments of the forcesapplied to the internal spring 5 by the weight of the window 1. The effective balancing force lies between the upper and lower limits of the cyclic variation and. thus equilibrium between the opposing forces may be attained during each phase of the cyclic variation. 'c

The links of the chain 7 are as shown of progressively increasing length and it will be evident from a consideration of Fig. 2 that as the chain is wound on to and from the drum 2 chain links of continually varying length are brought into action which cause an additionalvariation of a non-cyclic nature, in the moments of the forces applied to spring 5 by the weight of the body to be balanced to be superimposed on the said cyclic variation. The effect produced by this arrangement comprises a cyclic variation in the moments of the forces applied to the bal ancing force having progressively varying upper and lower limits.

. By suitably proportioning the size of the chain links the non-cyclic variation of the upper and lower limits of the force-moments applied to the balancing force may be such a'sto compensate for the increasing balanc ing force of the spring 5 as samerbecomes more highly Y tensioned. Undesired move ments of the window 1 on account of vibration and other disturbing influences is however, effectively prevented by the balancing force of the spring lying between the limits of the cyclic variation applied thereto by the weight of the body to be balanced; thus it is improbable that vibrational influences 1. A device for balancing bodies adapted for a rising and falling movement by balancing means exerting an ineonstant balancing force comprising a chain having links of progressively increasing length, means for applying the balancing force and the weight .of the body to be balanced to the opposite ends of said chain and means whereby on displacement of the body said chain is passed progressively over a smooth element.

2A device for balancing bodies adapted for a rising and fall-ing movement by balancing means exerting an inconstant balancing force comprising a-chain having links of progressively increasing length, means for applying the opposed forces to the opposite ends of said chain and means for passing said chain-over a smooth element on dis placement of the body, the position taken up by the links of' said chain around the smooth element applying a'combined cyclic and a progressive non-cyclic variation in the moments of the forces applied to the balancing means by the weight of the body to be balanced.

A device for balancing bodies adapted for a rising and falling movementby balanc ing means exerting an inconstant balancing force comprising a chain having links of progressively increasing length, a spring actuated drum onto which the said chain may be progressively wound, means for applying the weight of the body, to be balanced on one end of said chain and the position taken up by said chain links around said spring actuated drum causing a cyclic variation in the moments of the forces applied to the balancing means by the weight of the body to be balanced. a j V a 4-. A device for balancing bodies adapted for a rising and falling movement by balancing means exerting an inc'onstant balancing force comprising a chain having links of progressively increasing length, a spring actuated drum onto which said chain may be wound on displacement of the body and a.

relatively stationary attachment above said spring actuated drum to which the free end of such chain is connected, the positions taken up by said chain links around said spring drum causing a combined cyclic and progressive non-cyclic variation in the moments of the forces applied to the balancing spring by the weight of the bodyto be balanced.

5. 'A device for balancing bodies adapted for a rising and falling movement by balancing means exerting an inconstant balancing force comprlsing a chain having links of progressively increasing length, a rotatable drum below the'body to be balanced and displaceable therewith, a spring mounted interiorly of said drum and connected at one end thereto and at the other end to a non-rotatable support for said drum wherebya rotational force may be imparted to said drum, means for securing one end of said chain to the outer surface of said drum whereby on displacement of the body said chain is wound 'onto said drum and a stationary point above said drum to which thefree end of said chain is secured, the positions taken up by the chain links around said drum causing a combined cyclic and a progressive non-cyclic variation in the moments ofthe forces applied to the balancing-spring by the weight of the body to be balanced.

6. -A device for balancing bodies adapted for a rising and falling movement by balancing means exerting an inconstant balancing force comprising a chain having links of progressively increasing length, a spring actuated drum onto which the said chain may be progressively wound, means for applying the weight of the body to be balanced on one end 0f said chain and the position taken up by said chain links around said spring actuated drum causing a cyclic variation in the moments of-the forces applied to the balancing meansby the weight of the body to be balintermediate the upper and lower limits of such cyclic variation.

7. A device for balancing bodies adapted for a rising and falling movement by balancing means exerting an inconstant balancing force comprising a chain having links of progressively increasing length, a rotatable drum below the body to be balanced and displaceable therewith, a spring mounted interiorly of said drum and connected at one end thereto and at the other end to a non-rotatable support for said drum whereby on displacement of the body said chain is wound onto said drum and a stationary point above said drum to which the free end of said chain is secured, the positions taken up by the chain links around said drum causing a combined cyclic and a progressive non-cyclic variation in the moments of the forces applied to the balancing spring by the weight of the body to be balanced, and the efi'ective balancing force exerted by the spring always lying intermediate the upper and lower limits of such cyclic variation.

HARRY RILEY WEBB. HARRY NEWTON WEBB. 

